DefineYourOwnObject.md

Define Your Own Object

Use the Object object to implement your own objects.

To do so, you need to create 2 files.

• One with .h extension.
• One with .c extension.

Use the following template to implement your object. For example, you wish to define a new object with the "class name" of Circle:

• Create a new file named Circle.h with the following content:

  #ifndef CIRCLE_H
  #define CIRCLE_H
  
  #include "oop/oop.h"
  
  DEFINE_CLASS_H(Circle)
  
  Circle *CircleConstructor();
  
  #endif /* CIRCLE_H */

• Create a new file named Circle.c with the following content:

  #include "Circle.h"
  
  Circle *CircleConstructor() {
      Object *instance = ObjectConstructor("Circle");  
  
      instance->addIntegerRValueMember(instance, PUBLIC, FIELD, "name",
                                      (IntegerRValue) "smallCircle");
      printf("%s\n", (const char *) instance->getIntegerRValueMember(
                          instance, PUBLIC, FIELD, "name"));
      
      instance->addDoubleRValueMember(instance, PUBLIC, FIELD, "radius", 2.34);
      printf("%f\n", (double) instance->getDoubleRValueMember(instance,  PUBLIC,
                                                              FIELD,  "radius"));
      
      return (Circle *) instance;
  }

Use Your Newly Defined Object

Create Your Program

• Create a file named main.c.

• Use Circle in main.c.

  #include "oop/oop.h"
  
  #include "Circle.h"
  
  int main() {
      Circle *circle = CircleConstructor();
  
      /* 
       * `circle` is automatically freed, thus invoking `DESTRUCT_OBJECT` is not
       * required, but optional in case you want to destruct the object manually.
       */
  
      /* DESTRUCT_OBJECT(circle); */
  
      return 0;
  }